氢氧化钠改性亚麻对模拟孔雀石绿染料废水吸附性能研究

Study on adsorption performance of modified flax by sodium hydroxide on adsorption of simulated malachite green dye wastewater

以NaOH改性亚麻原料制备良好型吸附剂,用于对模拟孔雀石绿(Malachite Green-MG)染料废水的吸附研究。考察了吸附因素对NaOH改性亚麻吸附MG溶液的影响,采用吸附等温方程和反应动力学方程、吸附热力学参数进行机理分析,并利用SEM、FT-IR对亚麻改性前后进行结构表征。结果表明,在25℃、转速150r/min的条件下,MG溶液初始浓度为100mg/g、吸附时间60min、改性吸附剂用量0.1g,最大去除率和吸附量分别为96.13%、24.03mg/g。相比于Langmuir吸附等温方程(R^2=0.7522),NaOH改性亚麻对MG溶液的吸附更符合Freundlich吸附等温方程(R^2=0.9597),表明该吸附为多层吸附。相比于准一阶反应动力学方程(R^2=0.858),准二阶反应动力学方程(R^2=0.999)可以更好的描述NaOH改性亚麻对MG溶液的吸附,表明该吸附反应为化学吸附。

Sodium hydroxide（NaOH）as modifier was used to prepare modified flax and the adsorption performance was studied for malachite green-MG dye wastewater.The effective adsorptive factors of modified flax on MG solution were investigated.The adsorption isotherm equation and the reaction kinetic equation were used to fit the analysis.Scanning electron microscopy（SEM）and Fourier transform（FT-IR）were used to characterize the structure of flax before and after modification.The results showed that under the condition of temperature 25℃ and rotational speed 150r/min,the initial concentration of MG solution was 100mg/g,the adsorption time was 60 min,the dosage of modified adsorbent was 0.1g,the maximum removal rate and adsorption capacity of MG adsorption by modified flax were 96.13% and 24.03mg/g respectively.Comparing with the Langmuir adsorption isotherm equation（R^2=0.7522）,the adsorption by modified flax on MG solution was more consistent with the Freundlich adsorption isotherm equation（R^2=0.9597）,indicating that the adsorption was multilayer adsorption.Comparing with the quasi-first-order reaction kinetics equation（R^2=0.858）,the quasi-second-order reaction kinetics equation（R^2=0.999）can better describe the adsorption for MG solution,indicating that the adsorption reaction was chemisorption.